Revision by Prof. Kahan.

[unix-history] / usr / src / old / groups / groups.c

/*
* Copyright (c) 1980 Regents of the University of California.
* All rights reserved.  The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
*/

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1980 Regents of the University of California.\n\
All rights reserved.\n";
#endif not lint

#ifndef lint
static char sccsid[] = "@(#)groups.c    5.1 (Berkeley) %G%";
#endif not lint

/*
* groups
*/

#include <sys/param.h>
#include <grp.h>
#include <pwd.h>
#include <stdio.h>

int     groups[NGROUPS];

main(argc, argv)
       int argc;
       char *argv[];
{
       int ngroups, i;
       char *sep = "";
       struct group *gr;

       if (argc > 1)
               showgroups(argv[1]);
       ngroups = getgroups(NGROUPS, groups);
       for (i = 0; i < ngroups; i++) {
               gr = getgrgid(groups[i]);
               if (gr == NULL)
                       printf("%s%d", sep, groups[i]);
               else
                       printf("%s%s", sep, gr->gr_name);
               sep = " ";
       }
       printf("\n");
       exit(0);
}

showgroups(user)
       register char *user;
{
       register struct group *gr;
       register struct passwd *pw;
       register char **cp;
       char *sep = "";

       if ((pw = getpwnam(user)) == NULL) {
               fprintf(stderr, "No such user\n");
               exit(1);
       }
       while (gr = getgrent()) {
               if (pw->pw_gid == gr->gr_gid) {
                       printf("%s%s", sep, gr->gr_name);
                       sep = " ";
                       continue;
               }       
               for (cp = gr->gr_mem; cp && *cp; cp++)
                       if (strcmp(*cp, user) == 0) {
                               printf("%s%s", sep, gr->gr_name);
                               sep = " ";
                               break;
                       }
       }
       printf("\n");
       exit(0);
}